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case-control study
math.	estudo caso-controlo; estudo caso-referência; estudo rectrospectivo; amostragem baseada na escolha
math., Braz.	estudo caso-controle
med., pharma.	estudo de caso-controlo
stat.	estudo de casos com pares; estudo de comparação de casos

case-control study: 3 phrases in 3 subjects

Mathematics	1
Medical	1
Pharmacy and pharmacology	1